diff --git a/guitfx.c b/guitfx.c
index 11ffe2c..561156e 100644
--- a/guitfx.c
+++ b/guitfx.c
@@ -92,11 +92,12 @@ static void on_process(void *userdata, struct spa_io_position *position)
 									    // expr pedal
 							      		    float val_f = ((float)midi_data[2]) / 128.0;
 
-									    float thres = 0.4;
+									    float thres = 0.5;
 									    
 								            if ( val_f > thres ) {
-									        printf("Expr Pedal %f\n", val_f);
-										data->delay.mix = (val_f - thres) / (1.0-thres);
+   									        float expr_mix = (val_f - thres) / (1.0-thres);
+									        printf("Expr Pedal %f\n", expr_mix);
+										data->delay.mix = expr_mix;
 									    } else {
 									        data->delay.mix = 0.0;
 								            }